Expansion-bolt.



H. W. PLEISTEK. EXPANSION BOLT.

APPLICATION FILED P235 1910.

Patented 001125, 1910.

17 nigiugfiim,

- 77: 1 4 I r WITNESSES}, ms my W. m W49 n ATTORNEY HENRY W. PLEISTER,

i .To all whomit may concem:

'45 bolt 8.

' 1 UNITED STATES rarest OFFICE.

OF WESTIIELD, NEW JERSEY, ASSIGNOR TO HENRY B. NEW- HALL, OF PLAINFIELD.NEW JERSEY.

' EXPANSION-BOLT.

Be it known that I, Hnxnr \V. Pnars'rnn, a citizen of the United States,and a resident of Weslficl'd; in the county of Union and State of NewJersey, have invented certazn new and useful Improvements inExpansionllolts, of \vlllCll the following is a specification. taken inconnection with the accompapying drawings, which form a part of the 1()same.

' shown several illustrative embodiments of. my invention m which thesame reference numerals refer to similar parts in the several figures. vs

Figure 1 vis a vertical section through a i supportand theshie d, thebolt being shown in side elevation; Fig. 2 is an end view of the shieldshown in F 1g. 1; F 1g- 3 IS a vertical sectional \IQW through a supportshowmgm slightly modified forni of shield in side elevation; Fig. 4 is aside elevation of a 1110(llfi'ed form of shield; Fig. 5 is a sideelevation of another modified form of shield; and Fig.

(l is a side elevation of another modified form of shield.

In the illustrative embodiments of this invention shown in the drawing,1 is any suitable support of brick, masonry, cement or any othersupport, in which an aperture 2, of a given diameter, has hceumade for I'35 the insertion of'the shield 3 of my expansion a 'holt.

l have shown this shield made of two parts 4 and 5, (Fu 2) though thisnumber may l e varied wit tout departing from my i invention.

Simply for purposes of illustration, but with no idea; however. oflimiting my invcntimx, I have shdwirthe shield 3 provided with interiorscrew threads 6 to coiiperate with the male screw threads 7 upon the lagIt is to be distinctly understood, however, that the interior of theshield 3 may be plain or may be provided with machine screw threads orany other form, those shown being. as noted. simply for purposes ofillustration.

5.5 diameter from onoendto the other. On

Specification of Letters Patent.

Application filed February 2, 1910.. Serial No. 541,580.

this exterior surface ofthe shield, and upon each section 4 and 5, Iprovide a plurality of projections 11, Hand 12, 12 located in a certainmanner on the exterior sill-face of the shield and at. an angle to eachother. [The projections 11, 11 are preferably arranged on the forwardend of the shield 3 and are-formed of sue-ha height that that end of theshield is substantially equal to, or is slightly less, than the diameterof the aperture 2 within which the shield is to be mounted. The otherprojections 12, 12 are preferably mounted at the rear or opposite end ofthe shield so that they are on the end which is nearest to the face 13of the support 1 and consequently are on that portion of the shieldwhich is the last to be inserted in the aperture 2. The diameter of theshield plus the height of the projections 12 is alittle greater than thediameter of the shield plus the projections 11.

Preferably that portion of the shield provided with the pro ections 12,12 has a diameter. slightly in excess of the aperture 2 within which theshield is to be seated. This permits that portion of the shield providedwith the projections 11, 11 to be readily inserted withinthe aperture 2of the' support; 1 until the projections 12, 12 contact with theinterior surface of the aperture 2. These projections 12 in thepreferred form are of substantially a uniform height which for purposesof illustration is shown exaggerated in Fig. 1; they arealsoexaggerat'ed for the same purpose in the other figures of thedrawing.

7 As shown in Fig. 1 the two portions 4 and 5 of the shield are broughttogether and substantially half of the shield can be readil insertedwithin the'aperture 2 until the longitndinal projections 12, 12 contactwith the interior surface of the aperture. Pressure, or a soft blow. uon the two lnemlnas 4 and '5 of the shield Wlll then cause thelongitudinal projections 12, 12 to bite into the surface of the aperture2 and form shallow longitudinal furrows within which the projections12., 12 will be seated. This serves to hold the two portions 4 and 5 ofthe shield 3 together and in positito permit them to readily coiiperatewith the expanding, means which may be a lag screw such as shown in Fig.1, a machincbolt. or any other suitable expanding member. hi-1h uponinserting within the shi ld 23 wilt (when :1

the two members to expand and firmly grip the surface of the aperture 2in the support 1. I preferably arrange the transverse projections 11, 11at substantially right angles to the projections 12, 12. It will bereadily seen that by such an arrangement the projections 12, 12 firstbecome operative to hold the two parts 4 and 5 together within theaperture 2, ,but after the shield is expanded, in any suitable manner,the-end of the shield upon which the transverse projections 11, 11 \aremounted will be expanded to a greater extent than the front portionofthe shield and consequently the main holding or friction of the shieldwithin the aperture 2 will then be by means of the transverseprojections 11, 11 which are arranged at right angles to the line offorce which might be applied to the shield to withdraw it from thesupport; and, further, that the friction and the expanding force ofthese projections 11, 11 will be at a point removed from the face 13 ofthe support 1 and therefore less likely to crumble or mar it.

lVhile I preferably arrange the projections 11 and 12 in the term ofribs, they however may be varied withoutdeparting from the scope of myinvention. For instance the ribs may be mutilated or broken such asshown in Fig. 5.

In some instances I arrange the longitudinal ribs inclined, making thatend of the shield upon which they are mounted substantiallva frustu n ofa cone. Such-an arrangcinent is shown in Fig. 3 wherein the longitudinalribs 14, 14 are inclined. making the greatest diameter of the shieldplus the projections at the end 15 which would be the last to beinserted within the aperture 2 of the support 1. In some cases I mayform the longitudinal project-ions tapering from the center 16 to eachof its ends 17, 17 (Fig. 4) in which case the maximum friction or biteof the longitudinal ribs will be at the point 16.

Preferably the transverse projections are arranged only at the inner endof the shield and while I have shown them extending back on the shieldsubstantially half its length, this is a mere matter of degree for myinvention is not to be liniitedto this particular arrangement of theprojections. In some cases I may arrange the transverse projections ateither end of the shield and place the longitudinal projections in thecenter, such an arrangement being shown in F ig.'6. In all cases,however, 1 preferably, thou b not necessarily, form the exterior of thesiield 3 of substantially a uniform diameter thereby forming a cylinderof substantially a uniform diameter, and vary the height, shape andcontour of the transverse and longitudinal projections 11, 12,14 and 16.

When an expanding member provided with screw threads is used to expand'th different members 4 and 5 of the shield, the longitudinalprojections 12, 12' or 14, 14 serve to prevent relative movement of theparts 4 and 5 and also prevent the rotation or movement of the shieldwithin the aperture2, permitting the expanding member to be brought homewithin the shield 3 with a minimum amount of labor and without any lostmotion. By arranging the cylinder ofa substantially uniform diameter thetrans verse projections 11, 11 will readily slip within the aperture 2.It will take substantially little or no expanding force to cause them toengagewit-h the surface of the apeiture 2, and comparatively littleexpanding force to cause them to bite within the support whereby a. boltanchor is obtainedconnection with several illustrative embodimentsthereof, to the details of which I do not desire to'be limited, what isclaimed as new and what it is desired-to secure by LettersPatent-is setforth in the appended claim.

I claim a A shield for expansion bolts comprising a. plurality ofexpansion members forming a cylinder having its exterior surface ofsubstantially a uniform diameter throughout and provided with a taperedinteriorsurface, transverse projections on the forward exterior surfaceof the expansion members and longitudinal projections upon the rearexterior surface of the expansion members, making that end of theexpansion members of a diameter slightly greater than the end on whichthe transverse projections are

